IR 05000245/1987010
| ML20234E127 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 06/19/1987 |
| From: | Kottan J, Pasciak W NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | |
| Shared Package | |
| ML20234E080 | List: |
| References | |
| 50-245-87-10, 50-336-87-10, 50-423-87-11, NUDOCS 8707070469 | |
| Download: ML20234E127 (4) | |
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1 U.S. NUCLEAR REGULATORY COMMISSION
REGION I
50-245/87-10 50-336/87-10 Report Nos.
50-423/87-11 50-245 50-336 Docket Nos.
50-423 OPR-21 C
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DRP-65
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C License Nos.
NPF-49 Priority
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Category C
Licensee:
Northeast Nuclear Energy Company P. O. Box 270 Hartford, Connecticut 06141 Facility Name:
Millstone Nuclear Power Station, Units 1, 2 and 3 Inspection At:
Waterford, Connecticut Inspection Conducted:
May 18-20, 1987
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Inspector:
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J. J. Kottanj Rad ation Laborhtory Specialist date l
Approved by:
M bl9 T7 W. J. PascidA,CQ ief I
V date Effluents Radiation Protection Section Inspection Summary:
Inspection on May 18-20, 1987 (Combined Report Nos.
50-245/87-10, 50-336/87-10 and 50-423/87-11)
Areas Inspected: Routine announced inspection of the licensee's bioassay a
whole body counting program.
Areas reviewed included:
results of the whole body counting phantom analysis comparison, and procedur$. and data.
Results: Of the areas inspected, no violations were identified.
8707070469 870626 gDR ADOCK0500g5
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DETAILS 1.
Individuals Contacted Principal Licensee Employees R. Haynes, Station Services Superintendent
- J. Kangley, Radiological Services Supervisor W. Robinson, Assistant Radiation Protection Supervisor R. Sachatello, Radiation Protection Supervisor A. Tuttle, Station Technician C. DeBiasi, Station Technician
- E. Laine, Radiation Protection Supervisor
- J. Sullivan, Radiation Protection Supervisor The inspector also interviewed other licensee employees, including members of the health physics staff.
- Denotes those present at the exit interview.
2.
Introduction During this inspection, the licensee's capability to adequately perform radiological bioassay using a whole body counting system was reviewed. An NRC whole body counting phantom containing radioactive sources traceable
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to the National Bureau of Standards was submitted to the licensee for analysis.
The phantom duplicated the nuclides and the organ burdens that the licensee might encounter during normal operation. The phantom was analyzed using the licensee's normal methods and equipment.
3.
Comparison of Results The licensee uses three whole body counting systems:
a standup counter system, and two chair counter systems.
The standup counting system con-sists of two 4"x4"x16" NaI (T1) detectors coupled to a multichannel analyzer which is interfaced to a computer.
Each chair counting system consists of a 3"x3" NaI (Tl) detector for body counting and a 1.5"x0.5" NaI (T1) detector for thyroid counting which are coupled to a multichannel analyzer which is interfaced to a computer.
The system software is sup-plied by a vendor. The NRC phantom was counted for 60 seconds in the standup counter and 600 seconds in the chair counter. The lung results are based on an average of five measurement and the GI tract results are based on an average of three measurements.
Results of the comparisons are listed in Table I.
Based on these results, no violations were identified in this area.
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Initial results obtained from counting the phantom in the chair counting i
system indicated that the licensee had calibrated the chair counting systems for the lung diagnostic and GI tract diagnostic geometries with the body detector in the improper tosition.
This resulted in the licen-see's results being low by a factor of approximately two.
During this inspection, the licensee recalibrates one chair for the lung diagnostic and GI tract diagnostic geometries. The data presented in Table I for the chair counting system is the data obtained after the recalibration.. Data is presented from only one chair counting system because the licensee did not have enough time to' recalibrates the other chair' counting system during the inspection. The licensee's routine chair counting procedure requires.
that the initial whole body count is a whole body scan, and then if any activity is detected, a specific diagnostic count is performed. The licensee stated that since the incorrect calibrations were performed in March 1987, no diagnostic counts were performed with the chair counting systems. The licensee further stated that the other chair counting system-would be recalibrates for the diagnostic count geometries.
The inspector stated that completion of the recalibration would be reviewed during a subsequent inspection.
4.
Procedures and Data The licensee's procedures, HP908/2908/3908I, "Whole Body Courting (Chair)," and HP908/2900/3908I, "Whole Body Counting - Fastscan," were reviewed. Both procedures require daily source and background checks and, in addition, the chair procedure requires monthly source and gain checks.
Efficiency calibrations are required on an annual basis.
The inspector reviewed selected QC data for 1986 and 1987 to date.
Based on this review, the inspector discussed the' construction and use of control charts with the licensee as well as the need for data review, such as calibration data. The inspector noted that had the 1987 diagnostic geometry calibration data been plotted and compared to the 1986 diag-nostic geometry, the improper calibration would have been discovered.
The inspector stated that the licensee's whole body counting QC program and, in particular, the use of control charts would be reviewed during a subsequent inspection.
5.
Exit Interview The inspector met with the licensee representatives denoted in Paragraph I at the conclusion of the inspection on May 20, 1987.
The inspector sum-marized the purpose and scope of the inspection and the inspection findings.
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TABLE I RESULTS* OF PHANTOM DATA i
Standup Counting System NRC Known Licensee Licensee Result-Isotope Organ Value Result NRC Value
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Co-60 Lung 65 9 92 4 1.4210.21 Cs-137 Lung 92 12 14914 1,62 0.22 Co-60 GI 59 8 98 4 1.66 0.24 Cs-137 GI 83111 135 2 1.6310.22 Chair Counting System NRC Known Licensee Licensee Result Isotope Organ Value Result NRC Value Co-60 Lung 65 9 61 5 0.94 0.15 Cs-137 Lung 92 12 95 4 1.03 0.14 Co-60 GI 59 8 92 8 1.5610.25 Cs-137 GI 83 11 104 4 1.2510.17
- All values in nanocuries.
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